Many people jumping into the internet marketing world have trouble finding out what niche to target. There are many hidden niches that can pay off huge. There are also niches that are time-tested and will be around for many, many years.
Sometimes these niches are called evergreen niches. Thats because these niches always have people looking to buy something to help solve their problems. It would be a good idea to start targeting these niches as you always know theres a huge demand.
Love and Relationships: There is a wealth of niches in the relationships category, because there's so many stages of a relationship. There's always newbies to dating looking for a date and wondering how to act on a date. With regards to weddings, there's proposing, the whole wedding planning process and more. Also, marriages and relationships in general have strife and people always need advice.
There are tons of other ideas for niches in the relationships category. Since humans will always have problems in relationships, you can provide the solution and get paid to do so! Just learn about a problem, write a solution, and sell the solution, and you're set.
Financial Success: Financial success is another evergreen niche because people are always looking to get more money than they have now. If you know how to make money, and can teach people to do it, then you'll be able to make money in this niche about making money. Helping to solve financial problems can also be a great niche within the general making money niche. Debt consolidation, getting out of debt, savings, 401k's, etc.
Health: Niches in the general health market are great for two main reasons. The first reason is that there are many different niches available. Secondly, health niches usually pay very well for Adsense or affiliate marketing.
Weight loss is a very popular niche year round, within the health niche. Its popular after the New Year for everyone's resolutions. Its popular leading up to the summer to look good for the summer. Lastly, its popular because people want to look good for the holidays.
As with anything in life the more popular something is the more buyers you're likely to attract. If you decide on one of the niches mentioned in this article you'll be amazed how many offers you receive if and when you choose to sell. Choosing a niche in an established mainstream market gives you the security you won't find in a new market.